The reason to your problem is rooted in most people being low IQ egomaniacs. It's a fact in MMO's as it is irl.
I play a bodyguard/arsenal merc and do mostly healing in warzones. Without even trying it's not hard to be top healer and that's coming from a hyrbrid spec merc in the 30'ies. Indeed very sad ;(
What 99% of the playerbase fail to realize is, that PvP isn't all about DPS. Anyone having played Huttball should know this or at least have learn from trial and error, yet hardly anyone seem to have had such an epiphany.
I do both DPS and healing simply because it's what wins games AND I earn many more medals=recommendations+valor being versatile playing a hybrid role. If only more people playing healing capable classes could see this